64149512791 has 32 divisors (see below), whose sum is σ = 80068576896. Its totient is φ = 50042880000.

The previous prime is 64149512741. The next prime is 64149512809. The reversal of 64149512791 is 19721594146.

It is a cyclic number.

It is not a de Polignac number, because 64149512791 - 2⁷ = 64149512663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64149512731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2200551 + ... + 2229511.

It is an arithmetic number, because the mean of its divisors is an integer number (2502143028).

Almost surely, 2^64149512791 is an apocalyptic number.

64149512791 is a deficient number, since it is larger than the sum of its proper divisors (15919064105).

64149512791 is a wasteful number, since it uses less digits than its factorization.

64149512791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29323.

The product of its digits is 544320, while the sum is 49.

The spelling of 64149512791 in words is "sixty-four billion, one hundred forty-nine million, five hundred twelve thousand, seven hundred ninety-one".